Footnotes(1) The C-CPI-U is designed to be
a closer approximation to a cost-of-living index in that it, in its final
form, it accounts for any substitution that consumers make across item
categories in response to changes in relative prices. Since the
expenditure data required for the calculation of the C-CPI-U are available
only with a time lag, the C-CPI-U is being issued first in preliminary
form using the latest available expenditure data at that time and is
subject to two revisions.

NOTE: Indexes for 2011 are intial estimates. Indexes for
2010 are interim adjustments. Data prior to 2010 are final.NOTE: Index
applies to a month as a whole, not to any specific
date.